Method and apparatus for treatment of oil contaminated sludge
US4812225A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 10, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Feb 10, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F11/002
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Oil containing sludges are treated for the recovery of oil therefrom to render the resultant sludge disposable, by a process of conditioning the sludge to destabilize the emulsified phase thereof, centrifuging the destabilized sludge to obtain a solids-rich material which is largely hydrocarbon free and disposable, and a supernatant, hydrocarbon-containing liquid, and then subjecting the supernatant so formed to liquid/liquid phase separation. The conditioning is conducted so as to prepare a conditioned sludge characterized by a solids content of less than 50% by weight, a water content of less than 90% by weight, an oil phase with an API gravity of less than 12.degree., a continuous aqueous phase, and the solids in the sludge being primarily water wetted, this conditioned sludge being ready for centrifugation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.